ARM: dts: msm: Specify AMOLED regulator device for SM8150 QRD

Add AMOLED regulator device that controls OLEB/AB/IBB modules
which powers the triple supply needed for AMOLED panels. Enable
the device for SM8150 QRD.

Change-Id: Ied3b6eacf8eac8694c4e77fa8ea2e06de74f8260
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>